Differentiate endothermic and exothermic reaction ​

A popular example of an endothermic chemical reaction is photosynthesis.

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Exothermic Reactions.

Endothermic Reaction    Exothermic Reaction

The energy is absorbed from the surrounding into the reactionThe energy is released from the system to its environment.

Energy in the form of heatEnergy is released as heat, electricity, light or sound.

Explanation:

Exothermic reactions transfer energy to the surroundings. ... The reaction that does the complete opposite (it absorbs heat) is an endothermic reaction. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become hotter.

the correct answer is answer a. a mixture

no other options make sense

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  - sprinkles

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.